CN108546530B - Water-based adhesive and preparation method thereof - Google Patents
Water-based adhesive and preparation method thereof Download PDFInfo
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- CN108546530B CN108546530B CN201810296597.7A CN201810296597A CN108546530B CN 108546530 B CN108546530 B CN 108546530B CN 201810296597 A CN201810296597 A CN 201810296597A CN 108546530 B CN108546530 B CN 108546530B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
Abstract
The invention relates to a water-based adhesive and a preparation method thereof, wherein the water-based adhesive comprises the following components in parts by weight: 45.0-50.0 parts of acrylate emulsion; 45.0-50.0 parts of polyurethane dispersion; 3.0-6.0 parts of a plasticizer; 0.3-0.6 part of defoaming agent; 0.1-0.4 part of preservative; 0.6-1.3 parts of a thickening agent; a proper amount of water; the defoaming agent consists of a mineral oil defoaming agent and a molecular defoaming agent, and the thickening agent consists of a high-thixotropy thickening agent and a Newtonian fluid thickening agent. The high-speed glue spraying application is met, the spraying can be carried out under the condition that the material conveying speed is close to 300 m/min, the phenomena of glue flying, glue splashing, nozzle blockage and a large amount of bubbles are avoided, and the high-speed glue spraying device is suitable for sealing and attaching various materials and paperboards. The preparation method of the water-based adhesive formulates the reaction degree of each step according to the material characteristics, is simple and easy to implement, has low technical requirements on workers, and is suitable for large-scale popularization.
Description
Technical Field
The invention relates to the technical field of adhesives, in particular to a water-based adhesive and a preparation method thereof.
Background
At present, the printing and packaging industry begins to enter the industrialized development stage. The post-printing process also starts to be developed and a process well matched with printing is sought, so that the traditional manual or small mechanical process is gradually eliminated due to high labor cost and complex operational process defects, and novel post-printing equipment seeks a new profit point by taking semi-automatic or full-automatic equipment as a starting point.
In the seal-after-seal technology in the packaging field of cosmetic cases, toothpaste cases, food packaging cases and the like, the current development trend is to adopt automatic glue spraying, and the required material conveying speed reaches nearly 300 m/min. Most of the water-based spray adhesives in the market are easy to generate the phenomena of adhesive flying, adhesive splashing, nozzle blockage and a large amount of bubbles when being sprayed and applied at the speed, the production efficiency is reduced, and the package box has product defects such as core sticking, flower sticking and the like.
Therefore, the development of an aqueous adhesive capable of realizing a glue spraying application process of about 300 m/min is a problem which needs to be solved at present.
Disclosure of Invention
In view of the above, there is a need to provide a water-based adhesive which satisfies the requirement of high-speed glue spraying application, can be sprayed at a material conveying speed of approximately 300 m/min, does not generate the phenomena of glue splashing, nozzle blockage and a large amount of bubbles, and is suitable for sealing and jointing of various materials and paperboards.
The invention also provides a preparation method of the water-based adhesive, the preparation method establishes the reaction degree of each step according to the material characteristics, is simple and easy to implement, has low technical requirements on workers, and is suitable for large-scale popularization.
The water-based adhesive comprises the following components in parts by weight:
the defoaming agent consists of mineral oil defoaming agent and molecular defoaming agent, and the thickening agent consists of high thixotropy thickening agent and Newton fluid thickening agent.
Compared with the prior art, the water-based adhesive has the beneficial effects that: (1) the main adhesive component is composed of acrylate emulsion with low Tg and polyurethane dispersoid with high crystallization property, the acrylate emulsion with low Tg can provide very strong initial adhesion and low temperature resistance, the polyurethane dispersoid with high crystallization property can provide higher adhesive strength and high temperature resistance, the initial adhesion and the sustained adhesion of sealing and bonding of various materials such as UV surface, BOPP gluing surface, water-based gloss oil surface, gold and silver printing paper, laser surface, PE film coating surface and the like and a paperboard can be ensured, and the paper breaking rate of the paperboard can reach more than 90 percent after 24 hours of bonding and 24 hours of low temperature (-20 ℃) and high temperature (75 ℃) storage;
(2) the combination of the mineral oil defoaming agent and the molecular defoaming agent is selected, so that the aqueous adhesive can be ensured to completely eliminate bubbles under the actions of mechanical shearing and gas shearing and extrusion in high-speed adhesive spraying equipment, and the stability of the process and the bonding effect of the material are ensured;
(3) the thickening system adopts a high thixotropic thickening agent, so that the static viscosity of the water-based adhesive can be improved, the adhesive can not slide off when the nozzle stops working, and shear thinning is generated when the nozzle works to ensure smooth glue spraying, but the high thixotropic thickening agent has the defect that the adhesive is easy to splash; therefore, the invention also selects the Newtonian fluid thickener, so that the viscosity of the water-based adhesive can be quickly controlled to be thinned in the process of leaving the nozzle to run to the bonding material, and the splashing phenomenon is avoided; the combination of the high thixotropy thickening agent and the Newtonian fluid thickening agent is selected, so that the problems of glue flying, glue splashing, nozzle blockage and the like of the aqueous adhesive in the glue spraying application process with the material conveying speed close to 300 m/min can be avoided.
In one embodiment, the mass ratio of the mineral oil defoaming agent to the molecular defoaming agent is 0.2-0.4: 0.1 to 0.2.
In one embodiment, the mass ratio of the high thixotropy thickening agent to the Newtonian fluid thickening agent is 0.4-0.8: 0.2 to 0.5.
In one embodiment, the acrylate emulsion has a solid content of 45 to 60 wt% and a Tg (glass transition temperature) of-45 ℃ to-50 ℃.
In one embodiment, the polyurethane dispersion has a solids content of 40 to 51 wt.%.
In one embodiment, the polyurethane dispersion is selected from one or both of a polyester polyurethane dispersion and a polycarbonate polyurethane dispersion.
In one embodiment, the preservative is the dow corporation LX150, usa.
A preparation method of the water-based adhesive comprises the following steps:
sequentially putting 45.0-50.0 parts by weight of acrylate emulsion and 45.0-50.0 parts by weight of polyurethane dispersion into a reaction kettle, and uniformly stirring;
maintaining stirring, slowly adding 3.0-6.0 parts by weight of plasticizer into the reaction kettle, and uniformly stirring after the plasticizer is added;
slowly adding 0.3-0.6 part by weight of defoaming agent into the reaction kettle, and stirring until no foam is generated;
slowly adding 0.1-0.4 part by weight of preservative into the reaction kettle, and uniformly stirring;
slowly adding 0.6-1.3 parts by weight of thickening agent into the reaction kettle, and uniformly stirring;
adding 0-1.0 part by weight of water, stirring until all parameters of the glue solution are qualified, filtering and discharging to obtain the water-based adhesive.
In one embodiment, the technical parameters of the glue solution are as follows: solid content: 48 to 55 wt% (105 ℃/3 hours); viscosity: 12000 + -2000 mPas (NDJ-8s type viscometer, 4#/30RPM, 25 ℃); pH value: 7-8; VOC content: less than 20 g/L.
In one embodiment, the filtration is performed using a 200 mesh screen.
Drawings
FIG. 1 is a shear rheometer plot of example 1 of the invention and comparative example 1 tested using an AR1500ex dynamic shear rheometer;
FIG. 2 is a graph showing that the paper breaking rate of the toothpaste box obtained by applying 300 m/min high-speed spray glue to the PE film surface and attaching the PE film surface to the seal of the paperboard in the embodiment 3 of the invention for 24 hours is over 90% in a manual tear test after being respectively stored for 24 hours at high and low temperatures (A is at a high temperature of 75 ℃ and B is at a low temperature of-20 ℃).
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the following description. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The invention provides a water-based adhesive which is applied to a seal process after printing in the field of packaging, can be sprayed under the condition that the material conveying speed reaches nearly 300 m/min, and can not generate the phenomena of glue flying, glue splashing, nozzle blockage and a large amount of bubbles. The water-based adhesive comprises the following components in parts by weight:
the defoaming agent consists of mineral oil defoaming agent and molecular defoaming agent, and the thickening agent consists of high thixotropy thickening agent and Newton fluid thickening agent.
In some embodiments, the acrylate emulsion has a solid content of 45 to 60 wt% and a Tg of-45 ℃ to-50 ℃. When the solid content of the acrylate emulsion is less than 45 wt%, the emulsion is too thin and has poor viscosity, so that the viscosity of a final product is influenced; when the solid content of the acrylate emulsion is more than 60 wt%, the emulsion is too concentrated, and the processing difficulty is large.
In some embodiments, the polyurethane dispersion is selected from one or both of a polyester polyurethane dispersion and a polycarbonate polyurethane dispersion. Preferably, the polyurethane dispersion has a solid content of 40 to 51 wt%. When the solid content of the polyurethane dispersion is less than 40 wt%, the concentration of the whole glue solution is too thin, and the viscosity and other properties are not easy to control; when the solid content of the polyurethane dispersion is more than 51 wt%, the dispersion concentration is too high, and the dispersion effect is not good.
The defoaming agent of the water-based adhesive disclosed by the invention is a combination of a mineral oil defoaming agent and a molecular defoaming agent, so that bubbles of the water-based adhesive can be completely eliminated under the actions of mechanical shearing and gas shearing and extrusion in high-speed adhesive spraying equipment, and the stability of the process and the bonding effect of materials are ensured. Preferably, the mass ratio of the mineral oil defoaming agent to the molecular defoaming agent is 0.2-0.4: 0.1-0.2, the effect is better.
The mineral oil defoaming agent is selected from one or two of Foamaster 8034A and BYK-035. The molecular defoaming agent is one or two selected from defoaming agent AF and SURFYNOL MD-20.
The thickening system selects the high thixotropic thickening agent, can improve the static viscosity of the water-based adhesive so that the adhesive does not slide when the nozzle stops working, and generates shear thinning to ensure smooth glue spraying when the nozzle works, but the high thixotropic thickening agent has the defect that the adhesive is easy to splash. Therefore, the invention also selects the Newtonian fluid thickener, so that the viscosity of the water-based adhesive can be quickly controlled to be thinned in the process of running from the nozzle to the bonding material, namely the viscosity thinning speed of the water-based adhesive is slowed down, the proper viscosity is still kept before the adhesive reaches the material to be bonded, and the splashing phenomenon is avoided. The combination of the high thixotropy thickening agent and the Newtonian fluid thickening agent is selected, so that the problems of glue flying, glue splashing, nozzle blockage and the like of the aqueous adhesive in the glue spraying application process with the material conveying speed close to 300 m/min can be avoided. Wherein the mass ratio of the high-thixotropy thickening agent to the Newtonian fluid thickening agent is 0.4-0.8: 0.2 to 0.5, the effect is better.
The high thixotropy thickening agent is selected from one or two of RHEOLATE 299 and BYK-425. The Newtonian fluid thickener is one or two selected from RHEOLATE 212 and BYK-428.
In one embodiment, the preservative is the dow corporation LX150, usa.
Deionized water is selected as water, so that other impurities are prevented from being brought in, and the reaction effect of a reaction system is prevented from being influenced.
A preparation method of the water-based adhesive comprises the following steps:
and sequentially putting 45.0-50.0 parts by weight of the acrylate emulsion and 45.0-50.0 parts by weight of the polyurethane dispersion into a reaction kettle, and uniformly stirring. Preferably, the stirring speed is 38-42 rpm, and the solution does not splash out of the reaction kettle.
And maintaining stirring, slowly adding 3.0-6.0 parts by weight of plasticizer into the reaction kettle, and stirring uniformly after the plasticizer is added. Preferably, the stirring speed is 56-63 rpm, and the solution can not splash while being uniformly stirred.
And adjusting the stirring speed to 27-33 r/min, slowly adding 0.3-0.6 part by weight of defoaming agent into the reaction kettle, and stirring until no foam is generated. The stirring speed is 27-33 rpm, so that the defoaming agent can be slowly dissolved into the glue solution, and a good defoaming effect is achieved.
And maintaining the stirring speed of 27-33 r/min, slowly adding 0.1-0.4 part by weight of the preservative into the reaction kettle, and slowly dissolving the preservative into the glue solution for uniform dispersion.
Slowly adding 0.6-1.3 parts by weight of thickening agent into the reaction kettle, uniformly stirring, wherein the stirring speed is selected to be 47-55 rpm, the viscosity of the glue solution is gradually increased along with the addition of the thickening agent, and the stirring speed is selected to be 47-55 rpm, so that the glue solution is driven to mix with the viscous glue solution by stronger impulse force, and the viscosity of the glue solution is uniform.
Taking a sample of the glue solution, detecting the viscosity, solid content and pH value of the sample, adding a proper amount of water into the glue solution according to the detected parameters, and stirring until all the parameters of the glue solution meet preset requirements, wherein the stirring speed is 25-33 rpm, and the water is easy to splash out due to light weight and is mixed at the stirring speed, so that the water and the glue solution are slowly mixed without splashing. Filtering the glue solution by a 200-mesh screen and discharging to obtain the water-based adhesive.
The technical parameters of the glue solution are as follows: solid content: 50 + -1 wt% (105 deg.C/3 hr); viscosity: 12000 + -2000 mPas (NDJ-8s type viscometer, 4#/30RPM, 25 ℃); pH value: 7-8; VOC (volatile organic compounds) content: less than 20 g/L.
The main adhesive component of the water-based adhesive is composed of low-Tg acrylate emulsion and high-crystallinity polyurethane dispersoid, the low-Tg acrylate emulsion can provide very strong initial adhesion and low-temperature resistance, the high-crystallinity polyurethane dispersoid can provide higher adhesion strength and high-temperature resistance, the initial adhesion and the permanent adhesion of a UV surface, a BOPP (biaxially-oriented polypropylene) gluing surface, a water-based gloss oil surface, a gold and silver paper sheet, a laser surface, a PE (polyethylene) spraying surface and other materials and the sealing of a paperboard can be ensured, the requirement of the paper breaking rate of more than 90 percent can be met after 24 hours of bonding and 24 hours of low-temperature (-20 ℃) and high-temperature (75 ℃) storage, and the requirement of the sealed product packaging box for export transportation or severe application environment conditions can be met. The emission of volatile organic compounds of the water-based adhesive is low (less than 20g/L), the water-based adhesive meets the national environmental protection requirement, and the water-based adhesive has little harm to the health of workers and the environment in the using process.
The following is an example description.
Wherein, the adopted medicines and corresponding suppliers are shown in the following table 1:
TABLE 1
Example 1
The aqueous adhesive of the embodiment comprises the following components by mass:
the defoaming agent consists of mineral oil defoaming agent and molecular defoaming agent, and the thickening agent consists of high thixotropy thickening agent and Newton fluid thickening agent.
The water is deionized water.
The preparation method of the water-based adhesive comprises the following steps:
46.0 kg of the acrylate emulsion (solid content: 55. + -. 1 wt%, Tg: -45 ℃ to-50 ℃) and 48.0 kg of the polycarbonate polyurethane dispersion (solid content: 50. + -. 1 wt%) were put into a reaction vessel in this order, the stirring speed was increased to 40 revolutions per minute, and the stirring was carried out for 15 minutes.
Stirring was maintained, 4.0 kg of plasticizer Hexamoll DINCH was slowly added, and after the addition, the stirring speed was again increased to 60 rpm, and stirring was maintained for 15 minutes.
The stirring speed was adjusted to 30rpm, 0.3 kg of mineral oil defoamer, Foamaster 8034A, and 0.2 kg of molecular defoamer, SURFYNOL MD-20, were slowly added, and stirring was maintained for 15 minutes.
Then 0.2 kg of the preservative LX150 was slowly added thereto, and the stirring was continued for 5 minutes.
Then, 0.8 kg of the high thixotropic thickener rheelate 299 and 0.2 kg of the newtonian fluid thickener rheelate 212 were slowly added, the stirring speed was adjusted to 50 rpm, and the stirring was maintained for 30 minutes.
0.3 kg of deionized water is added, stirred at the speed of 30 revolutions per minute for 10 minutes to test the parameters to be qualified, and filtered by a 200-mesh screen double layer to obtain the water-based adhesive of the embodiment 1.
The technical parameters of the aqueous adhesive of example 1 are as follows: solid content: 50.3 wt% (105 ℃/3 hours); viscosity: 13200 mPa.s (NDJ-8s viscometer, 4#/30RPM, 25 ℃); pH value: 7.4 of the total weight of the mixture; VOC content: 10.5 g/L.
Example 2
The aqueous adhesive of the embodiment comprises the following components by mass:
the defoaming agent consists of mineral oil defoaming agent and molecular defoaming agent, and the thickening agent consists of high thixotropy thickening agent and Newton fluid thickening agent.
The water is deionized water.
The preparation method of the water-based adhesive comprises the following steps:
45.0 kg of the acrylate emulsion (solid content: 57. + -. 1 wt%, Tg: -45 ℃ to-50 ℃) and 50.0 kg of the polycarbonate polyurethane dispersion (solid content: 46. + -. 1 wt%) were put into a reaction vessel in this order, the stirring speed was increased to 40 rpm, and the stirring was carried out for 15 minutes.
Keeping stirring, slowly adding 6.0 kg of plasticizer K-FLEX 850S, after adding, starting the stirring speed to 60 r/min, and keeping stirring for 15 min.
The stirring speed is adjusted to 30 r/min, 0.3 kg of mineral oil defoamer BYK-035 and 0.1 kg of molecular defoamer AF are slowly added, and the stirring is maintained for 15 min.
Then 0.3 kg of the preservative LX150 was slowly added thereto, and the stirring was continued for 5 minutes.
Then, 0.6 kg of a highly thixotropic thickener BYK-425 and 0.35 kg of a Newtonian fluid thickener BYK-428 were slowly added, the stirring speed was adjusted to 50 revolutions per minute, and the stirring was maintained for 30 minutes.
0.25 kg of deionized water is added, the mixture is stirred at the speed of 30 revolutions per minute for 10 minutes, the test parameters are qualified, and the mixture is filtered by a 200-mesh screen and discharged in a double-layer mode to obtain the water-based adhesive of the embodiment 2.
The technical parameters of the aqueous adhesive of example 2 are as follows: solid content: 50.6 wt% (105 ℃/3 hours); viscosity: 12960 mPa.s (model NDJ-8s viscometer, 4#/30RPM, 25 ℃); pH value: 7.6; VOC content: 11.2 g/L.
Example 3
The aqueous adhesive of the embodiment comprises the following components by mass:
the defoaming agent consists of mineral oil defoaming agent and molecular defoaming agent, and the thickening agent consists of high thixotropy thickening agent and Newton fluid thickening agent.
The water is deionized water.
The preparation method of the water-based adhesive comprises the following steps:
47.0 kg of the acrylate emulsion (solid content: 50. + -. 1 wt%, Tg: -45 ℃ to-50 ℃) and 47.0 kg of the polycarbonate polyurethane dispersion (solid content: 42. + -. 1 wt%) were put into a reaction vessel in this order, the stirring speed was increased to 40 rpm, and the stirring was carried out for 15 minutes.
Stirring is maintained, 4.5 kg of plasticizer K-FLEX 850S is slowly added, after the addition is finished, the stirring speed is increased to 60 revolutions per minute, and the stirring is maintained for 15 minutes.
The stirring speed was adjusted to 30rpm, 0.3 kg of mineral oil defoamer, Foamaster 8034A, and 0.15 kg of molecular defoamer, SURFYNOL MD-20, were slowly added, and stirring was maintained for 15 minutes.
Then 0.25 kg of the preservative LX150 was slowly added thereto, and the stirring was continued for 5 minutes.
Then, 0.6 kg of the high thixotropic thickener rheelate 299 and 0.2 kg of the newtonian fluid thickener rheelate 212 were slowly added, the stirring speed was adjusted to 50 rpm, and the stirring was maintained for 30 minutes.
0.4 kg of deionized water is added, the mixture is stirred at the speed of 30 revolutions per minute for 10 minutes, the test parameters are qualified, and the mixture is filtered by a 200-mesh screen and discharged in a double-layer mode to obtain the water-based adhesive of the embodiment 3.
The technical parameters of the aqueous adhesive of example 3 are as follows: solid content: 50.4 wt% (105 ℃/3 hours); viscosity: 13130 mPa. multidot.s (model NDJ-8s viscometer, # 4/30 RPM, 25 ℃); pH value: 7.5; VOC content: 10.2 g/L.
Example 4
The aqueous adhesive of the embodiment comprises the following components by mass:
the defoaming agent consists of mineral oil defoaming agent and molecular defoaming agent, and the thickening agent consists of high thixotropy thickening agent and Newton fluid thickening agent.
The water is deionized water.
The preparation method of the water-based adhesive comprises the following steps:
48.0 kg of the acrylate emulsion (solid content: 56. + -. 1 wt%, Tg: -45 ℃ to-50 ℃) and 45.0 kg of the polycarbonate polyurethane dispersion (solid content: 50. + -. 1 wt%) were put into a reaction vessel in this order, the stirring speed was increased to 40 rpm, and the stirring was carried out for 15 minutes.
Stirring was maintained, 5.0 kg of plasticizer Hexamoll DINCH was slowly added, and after the addition, the stirring speed was again increased to 60 rpm, and stirring was maintained for 15 minutes.
The stirring speed was adjusted to 30rpm, 0.4 kg mineral oil defoamer Foamaster 8034A and 0.1 kg molecular defoamer AF were slowly added and stirring was maintained for 15 minutes.
Then 0.3 kg of the preservative LX150 was slowly added thereto, and the stirring was continued for 5 minutes.
Then, 0.55 kg of the high thixotropic thickener rheelate 299 and 0.35 kg of the newtonian fluid thickener BYK-428 were slowly added, the stirring speed was adjusted to 50 revolutions per minute, and the stirring was maintained for 30 minutes.
Adding 0.3 kg of deionized water, stirring at the speed of 30 revolutions per minute for 10 minutes to test the parameters to be qualified, and filtering and discharging through a 200-mesh screen to obtain the water-based adhesive.
The technical parameters of the water-based adhesive of the embodiment are as follows: solid content: 49.9 wt% (105 ℃/3 hours); viscosity: 13020 mPas (model NDJ-8s viscometer, 4#/30RPM, 25 ℃); pH value: 7.4 of the total weight of the mixture; VOC content: 10.1 g/L.
Example 5
The aqueous adhesive of the embodiment comprises the following components by mass:
the defoaming agent consists of mineral oil defoaming agent and molecular defoaming agent, and the thickening agent consists of high thixotropy thickening agent and Newton fluid thickening agent.
The water is deionized water.
The preparation method of the water-based adhesive comprises the following steps:
50.0 kg of an acrylate emulsion (solid content: 46. + -. 1 wt%, Tg: -45 ℃ to-50 ℃) and 46.0 kg of a polycarbonate polyurethane dispersion (solid content: 41. + -. 1 wt%) were put into a reaction vessel in this order, the stirring speed was increased to 38 rpm, and the stirring was carried out for 15 minutes.
Stirring was maintained, 3.0 kg of plasticizer Hexamoll DINCH was slowly added, and after the addition, the stirring speed was again increased to 58 rpm, and stirring was maintained for 15 minutes.
The stirring speed was adjusted to 30rpm, 0.2 kg mineral oil defoamer Foamaster 8034A and 0.1 kg molecular defoamer AF were slowly added and stirring was maintained for 15 minutes.
Then 0.1 kg of the preservative LX150 was slowly added thereto, and the stirring was continued for 5 minutes.
Then, 0.4 kg of the high thixotropic thickener rheelate 299 and 0.2 kg of the newtonian fluid thickener BYK-428 were slowly added, the stirring speed was adjusted to 50 revolutions per minute, and the stirring was maintained for 30 minutes.
Adding 0.2 kg of deionized water, stirring at the speed of 30 revolutions per minute for 10 minutes to test the parameters to be qualified, and filtering and discharging through a 200-mesh screen to obtain the water-based adhesive.
The technical parameters of the water-based adhesive of the embodiment are as follows: solid content: 52 wt% (105 ℃/3 hours); viscosity: 12071 mPa.s (NDJ-8s type viscometer, 4#/30RPM, 25 ℃); pH value: 7.3; VOC content: 11.5 g/L.
Comparative example 1
This comparative example was the same as example 1 except for the thickener, and the other components and preparation method were the same. The thickener of this comparative example was prepared by replacing 0.8 kg of a mixture of the high thixotropic thickener rheloate 299 and 0.2 kg of the newtonian fluid thickener rheloate 212 with 1.0 kg of the high thixotropic thickener rheloate 299.
The technical parameters of the aqueous adhesive of comparative example 1 are as follows: solid content: 50.2 wt% (105 ℃/3 hours); viscosity: 12835 mPa.s (model NDJ-8s viscometer, 4#/30RPM, 25 ℃); pH value: 7.4 of the total weight of the mixture; VOC content: 10.9 g/L.
From the comparison of the technical parameters of the aqueous adhesives of example 1 and comparative example 1, the viscosity of comparative example 1 is reduced compared with the viscosity of example 1, and other technical parameters are similar.
The aqueous adhesives of example 1 and comparative example 1 were taken and tested for shear rheology using an AR1500ex dynamic shear rheometer, as shown in fig. 1. As can be seen from fig. 1, the shear rate of the aqueous adhesive of example 1 was high, that is, the viscosity of the adhesive liquid was reduced at the time of spraying, and the adhesive liquid was not easily splashed at the time of spraying at a high speed. The thickening system of the water-based adhesive adopts the combination of the high-thixotropy thickening agent and the Newtonian fluid thickening agent, and compared with the thickening system using the high-thixotropy thickening agent alone, the shear rate of the obtained water-based adhesive is more suitable for being applied to a high-speed adhesive spraying process, and the water-based adhesive is not easy to splash during high-speed adhesive spraying.
FIG. 2 is a graph showing that in example 3 of the present invention, after being applied to a PE film coated surface by a 300 m/min high speed spray adhesive and bonded to a seal of a paperboard, a toothpaste box is cut into 3.5cm wide after 24 hours, and after being stored for 24 hours at high and low temperatures (A is a high temperature of 75 ℃ and B is a low temperature of-20 ℃), the paper breaking rate of the paperboard is more than 90% by a manual tearing test, that is, the breaking area of the paperboard is more than 90% when the paperboard is torn off. The PE film surface is tightly attached to the seal of the paperboard, after 24 hours of attachment, the water-based adhesive meets the requirement that the paper breaking rate reaches over 90 percent after the PE film surface and the paperboard are stored at low temperature (-20 ℃) and high temperature (75 ℃) for 24 hours, and the sealed product packaging box can withstand the requirements of export transportation or severe application environment conditions.
The VOC content of the water-based adhesives of the embodiments 1 to 5 is lower than 12g/L, which meets the requirement of environmental protection and has little harm to the health of workers and the environment.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The water-based adhesive is characterized by comprising the following components in parts by weight:
the defoaming agent consists of a mineral oil defoaming agent and a molecular defoaming agent, and the thickening agent consists of a high thixotropy thickening agent and a Newtonian fluid thickening agent; the high thixotropy thickening agent is selected from one or two of RHEOLATE 299 and BYK-425; the Newtonian fluid thickener is one or two selected from RHEOLATE 212 and BYK-428.
2. The aqueous adhesive as claimed in claim 1, wherein the mass ratio of the mineral oil defoaming agent to the molecular defoaming agent is 0.2-0.4: 0.1 to 0.2.
3. The aqueous adhesive according to claim 1, wherein the mass ratio of the high thixotropy thickener to the Newtonian fluid thickener is 0.4-0.8: 0.2 to 0.5.
4. The aqueous adhesive according to claim 1, wherein the acrylate emulsion has a solid content of 45 to 60 wt% and a Tg of-45 ℃ to-50 ℃.
5. The aqueous adhesive according to claim 1, wherein the polyurethane dispersion has a solid content of 40 to 51 wt%.
6. The aqueous adhesive according to claim 1 or 5, wherein the polyurethane dispersion is one or both of a polyester polyurethane dispersion and a polycarbonate polyurethane dispersion.
7. The aqueous adhesive according to claim 1, wherein the preservative is LX150, dow corp.
8. The preparation method of the water-based adhesive as claimed in any one of claims 1 to 7, which is characterized by comprising the following steps:
sequentially putting 45.0-50.0 parts by weight of acrylate emulsion and 45.0-50.0 parts by weight of polyurethane dispersion into a reaction kettle, and uniformly stirring;
stirring is maintained, 3.0-6.0 parts by weight of plasticizer is slowly added into the reaction kettle, and after the plasticizer is added, stirring is carried out uniformly;
slowly adding 0.3-0.6 part by weight of defoaming agent into the reaction kettle, and stirring until no foam is generated;
slowly adding 0.1-0.4 part by weight of preservative into the reaction kettle, and uniformly stirring;
slowly adding 0.6-1.3 parts by weight of thickening agent into the reaction kettle, and uniformly stirring;
adding a proper amount of water, stirring until all parameters of the glue solution are qualified, filtering and discharging to obtain the water-based adhesive.
9. The preparation method of the water-based adhesive according to claim 8, wherein the technical parameters of the adhesive solution are as follows: solid content: 48-55 wt%, and the detection condition is 105 ℃/3 hours; viscosity: 12000 +/-2000 mPa & s, the detection condition is NDJ-8s type viscometer, 4#/30RPM, 25 ℃; pH value: 7-8; VOC content: less than 20 g/L.
10. The method for preparing the water-based adhesive according to claim 8, wherein the filtering is performed by using a 200-mesh screen.
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| CN112679972A (en) * | 2020-12-24 | 2021-04-20 | 江苏馨而美木业有限公司 | Preparation method of environment-friendly flame-retardant corrosion-resistant nano composite fiber base material |
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| CN104212400A (en) * | 2013-06-04 | 2014-12-17 | 禹辉(上海)转印材料有限公司 | Water-based ABS(acrylonitrile butadiene styrene) glue for transfer printing and preparation method thereof |
| CN104946166A (en) * | 2015-06-27 | 2015-09-30 | 广东远东高分子科技有限公司 | Water-based spray gel and preparation method thereof |
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| CN104212400A (en) * | 2013-06-04 | 2014-12-17 | 禹辉(上海)转印材料有限公司 | Water-based ABS(acrylonitrile butadiene styrene) glue for transfer printing and preparation method thereof |
| CN104946166A (en) * | 2015-06-27 | 2015-09-30 | 广东远东高分子科技有限公司 | Water-based spray gel and preparation method thereof |
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